Mason, along with 15-year-old Kashius Brazeal, of Benicia, are believed to have escaped from "the yard," an enclosed, secured, outdoor area surrounded by a concrete wall sometime between 12:45 p.m. and 1 p.m., DeWall said.

Shortly after learning the teens had escaped, deputies found Juvenile Hall clothing believed to have discarded by Mason and Brazeal on Boynton Avenue in Fairfield, DeWall said.

Brazeal, who was being held in Juvenile Hall for "multiple property crimes," including burglary and attempted burglary, remains at large. He is described as a black male, approximately 5-foot-10 and 140 pounds with black hair and brown eyes.

The teens' method of escape is still under investigation, although authorities say no force was used in their getaway.

Mason, who had been in custody for attempted burglary and vandalism was booked at the Solano County Jail, located at 500 Union Avenue, Fairfield.

Anyone with information as to the Brazeal's whereabouts are urged to contact Sheriff's Office 24-hour dispatch center at 421-7090.